I don't have samsung HDD's its Seagate. Read the OP properly.
Hydro Series H80 is for Processor and the Hydro Series H100 is a "Radiator" which I have fitted to the front of my PC.
Everything is compatible with XP. Even if you have the crappiest config XP is going to run smoothly. It may not have the Graphics or User Friendliness but it gets the job done and well.
Most of hardcore gamer's use XP until now to keep up with competition Alienware used to use XP on gaming laptops. They still have an option for Ultimate Gaming Experience their own modified XP Package. They also recommend XP for their PC's.
The H80 and the H100 are two different CPU water-cooling blocks with different radiators.
Still not seeing anything anywhere online where you can purchase a 5TB Seagate HDD. Maybe a 5TB NAS, but not an internal 5TB HDD.
Everything that is compatible in XP is compatible in Windows 7. I've yet to run into any major software that I can get Windows 7 to run. The two times I've had issues with a program, I've been able to get it running in a VM.
Most "Hardcore gamer's" would realize that Windows XP completely cuts into their system resources. Like you, spending all that money on 16GB of RAM when Windows will only see 4GB of that, before it calculates in how much Video Memory that video card of yours has (I'm guessing 1.2GB) so you're suddenly down to only 2.8GB of the 16GB you have installed. If you have to ask why would I say that, then you're not a "hardcore gamer". You're just another person with daddy's credit card.
Also, XP doesn't really play as well with multi-core processors compared to Windows 7. So tell me again why "Hardcore Gamers" only use XP.